Devon discovers his people live on a huge spacecraft and is sentenced to death for heresy when he states this. He escapes, and his betrothed Rachel and friend Garth follow him on his journey.
While Garth is held by "cavemen" descendants of the service crew, Devon and Rachel awaken one of the ship's engineers from suspended animation to help repair the Ark.
The trio visit a biosphere populated only by men, whose governor desires to marry Rachel, who resembles a goddess worshipped in the community.
An exploratory vessel returns after a 10-year journey, but due to time dilation, 400 years have passed since its departure.
Thinking they have found the backup bridge of the Ark, the trio discover a module occupied by children who believe that they have been piloting the Ark since it left Earth.
A scientist intent on breeding a hardier race of humans tries to prove that man is too selfish.
A disillusioned man triggers the self-destruction of the Ark but intends to escape; he and Devon must undergo miniaturization to stop the detonation.
A computer desires to become autonomous and tricks the trio into completing its programming.
The trio find their way past a mysterious high-security biosphere entrance and discover a distrusting, power-mad ruler who tries to assure them of his peaceful intentions while he pollutes his city to produce armaments.
An alien sent on a reconnaissance mission has crashed into the Ark and is now harvesting parts to repair his ship to return home; Garth falls for a woman who must leave with Oro in order to survive.
After Devon is injured by radiation, a medical ship that orbits the Ark comes to his aid, but the doctor who can help him is too intrigued by the possibility of helping aliens who have signaled for help.
The trio visit a biosphere where a despotic servant to the leader terrorizes the population with pain produced from mandatory implants.
Oro returns as commander of Earthship Ark. He tells the trio and their temporary companion that his home world can support the people from Earth, but Devon discovers otherwise when a robot is asked the correct questions.
A scientist alters the Ark's course to pass through a comet's tail so he can study it; Devon must make an EVA to rewire a panel so the service reactors can be fired again; cometary debris damages the biospheres.
The trio visit a science installation where a scientist has bred giant mutant bees.
Garth decides to return to Cypress Corners, but he is recruited into the inter-ark police force by an officer intending to take a flight to assist in resolving an interplanetary conflict.
1st TV Movie, edited from episodes "Voyage of Discovery" and "The Goddess Calabra".
2nd TV Movie, edited from episodes "The Pisces" and "Farthing's Comet".
3rd TV Movie, edited from episodes "Mr. Smith of Manchester" and "Gallery of Fear".
4th TV Movie, edited from episodes "The Alien Oro" and "The Return of Oro".
5th TV Movie, edited from episodes "Astro-Medics" and "The Implant People".
